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    <h4>时间管理</h4>
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        <li>UTC(Universal Time Coordinated)</li>
        <li>GMT(Greenwich Mean Time)</li>
        <li>UTC和GMT一样，都与英国伦敦的本地时相同</li>
        <li>UTC + 时区差 ＝ 本地时间</li>
        <li>UTC + (＋0800) = 本地（北京）</li>
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